Method of removing the burr formed in welding



P. M. HALL. ET AL METHOD OF" REMOVING THE BURR FORMED IN WELDI NG Filed Sept; 4, 1924' woe/wt 5 Patented Mar. 30,, 1926.

UNITED STATES PATENT orr es.

PRESTON MARTIN HALL, WORCESTER, AND WOLCO'IT BEIiifllbl'G'llOlil', F SWAIlT- SCOTT, KLSSAGHUSETTS, ASSIGNORS TO THOMSON ELECTRIC WELDING COMPANY,

I31 LYNN, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

METHOD OF REMOVING THE BURR FOR'fiIED IN WELDING.

Application filed September 4, 1924. Serial No. 735,?65.

welding or other welding operation.

. The mvention is especially useful in electric welding o erations and particularly in butt-welding, or which reason it will be described as carried out in that specific method 01 welding known as the electric resistance a method wherein the parts are brought into contact and heated by the passage of the current after which, on the attainment of the welding temperature, they are forced to:

V gether to form a weld with the usual attendant enlargement formed of upset metal. Heretofore various expedients have been resorted to for e'fi'ectually removing the upset metal or for smoothing it down, none of 80, which have been satisfactory'because of expense or because the excess metal which de-' forms the product is not thoroughly removed.

Our present invention consists essentlally 36 in directing upon the heated upset metal air or other combustion promoting gas or fillYCl f in amount sufiicienttoconsume or burn away the heated burr or upset. The stream of oxygen containing gas such as air or other 40 gas srving to unite with the heated material and burn the same away may be applied 1n any desired way through nozzles, pipes or orifices in the clamping and welding devices by which the gas in sufiicient amount to promote combustion applied for a sufli'eient time to entirely consume the heated upset may be applied and directed upon Conveniently, 1n the case of a butt-weld1ng machine for instance, the gas conducting and directing passages may' be formed in the welding clamps. Y

' In the drawings-we have shown in Vertical section a typical construction adapted to the carrying on of the process, the parts being shown in Fig. l-in cross-section while in Fig. 2 one of the welding clamps is shown in end view looking from a point between the two clamps. 4

1 indicates clamps for holding a bar, rod I or pipe of metal as usual in the welding art and for supplying the heating or welding current to the bars, rods or other work 2 secured 1n said clamps. The means for supplying pressure to the bars or rods 2 that are to be welded together are of any proper construction and it is not necessary to desciibe them as they are well known in the ar At 3 is indicated the usual upset formed by the application of end pressure to the heated section of work. solid bar said'upset' appears only on the exterior of the work but in the case of a tube it would appear also upon the inside of the tube. To remove this enlargement is the objec of our invention, accomplished in the present illustration of the same by providing one or both of the welding clamps with passageways 4 terminating in the face of the clamp and connected witha supply passageway 5 into which the air or other aid to the burning or combustion and consumption of I the metal is introduced from supply pipe6 in any desired way. The orifices in the face ofeach clamp are sufficient in number and are so disposed as to direct the blast of air In-the case of a 7 or other gas directly upon the heated or incandescent metal heated by the electric current passed through the joint and. extruded as a burr by the application of the welding pressure. Preferably said blast in the case of the welding of two pieces of metal together end/to end is applied in a manner to substantially encircle the 'oint. Said air or gas is supplied in su cient amount and for a sufiicient length of time to secure a complete burning away or con, sumption of the heated metal of the enlargement as preferably fast as it forms or in other words simultaneously with the application of the welding pressure or' at the time of the formation of the welded joint, the heating ,being continued gif necessary after the Weici completed? in erdei' to keep up the tempeiafiure ancl ins'ni'e tiie con'lpiete consumpfiion izlie enlargement.

Obviously flie neizure' 0f the comb'sisiimv 5' aiding; gas will elepenc'i upon ehe the metal In some cases a blast 0f oxygengas might ise empioyecl er in ,C'til'ififiSBS gas such as chlei izie 'niglzt be nserl. in zlie case of a tube i. enlargement Within the same can be rernsveri in the same manner by supplyin ifilie air or other gas in the interior of tee tube to burn away the upset metal during 01' afier the weld is foniied.

We are aware that it has been before prm posed to blow or sweep awn by the mechanical action of a current or last of air, m0iten 01' scintillating pareicies of metal pro duced by an initial sparking contact at the opposed ends of he Woricencl also the overheafied metal or metal reduced to a fluid state and extruded by the Welding pressure. Our invention differs from such prior prsictice in thai: the operation is conducted upon the heated metal which has been l'Jl'OlIgl'li] is a welding temperature which being upsc; or (iispiaced sidewise in theproduciion of the Weld, would form an enlargement or bulge around the place of Welding. in the previous pyocess the operation is mechanical and is applied only to such portion of the metal as is i'educei to a fillid smite and is not involved in the Weld, While by one invention I we remove that portion 01% the metal which is brought its welding aempembure er in 85 other WOEdSif plastic only and a remit iii) iipeei er disgilaee wise anti wnuid remain a5 e. 0? e Wcldcci il'li; chimes 011w izw The herein described 1m electric but; welding cenq the er burr i'cnn E) r'cssui'e while said burr? i.

E: ion (inc ":0 the applied '5 wing the i'nei'ai up to welding by directing; a burr removing s'bi'ezun m' 0i? cumbusiieneiding fluid 0mm said be i'cnm've the same While so heated.

The method of picveming lie 50mmtion of a bum in an eieciz'ic butbwciding w operation consistin" in directing upon the heated metal of t e burr 'eimulmneously with the application of the Welciing sure, a stresim or blast of combussien-aiciing fluid in amount s'uflicient to consume or burn away the upset.

3. The-meiiod of removing the upset formed in an electric butteveiciing opera,- tion consisting applying a size; 1 or blast of a combustion-aiding fluid e remindingthe work and ciir cte i upon hezital. mew! of 116 upset hut-mg its fmmaeien in amount sufiicieni inc cc nsume' 0i. bum said upset Signed at in. the cet'ziy Essex 6 and State 41f Mm. this. 20th day 0;? August PRESTU'N i Mill} N UL. 

